2021 Mazda MX-5 Miata Club, Automatic TransFACTORY OEM SERVICE PROCEDURE

Input device

x: Applicable

Item MAIN RELAY CONTROL DRIVE-BY-WIRE CONTROL HYDRAULIC VARIABLE VALVE TIMING CONTROL ELECTRIC VARIABLE VALVE TIMING CONTROL FUEL INJECTION CONTROL SYSTEM FUEL PUMP CONTROL HIGH PRESSURE FUEL PUMP CONTROL ELECTRONIC SPARK ADVANCE CONTROL PURGE CONTROL A/F SENSOR HEATER CONTROL HO2S HEATER CONTROL A/C CUT-OFF CONTROL ELECTRICAL FAN CONTROL STARTER CUT-OFF CONTROL GENERATOR CONTROL ENGINE OIL CONTROL
APP sensor No. 1, No. 2   x x   x     x x     x x      
TP sensor No. 1, No. 2   x     x             x        
MAF sensor   x x x x   x x x       x     x
IAT sensor No. 1   x   x x     x x       x      
IAT sensor No. 2   x   x x     x                
MAP sensor   x   x x     x x             x
CKP sensor   x x x x x x x x     x x x x x
Intake CMP sensor   x   x x     x                
Exhaust CMP sensor   x x   x   x x                
ECT sensor No. 1   x x x x   x x x     x x x   x
Fuel pressure sensor   x     x x x                  
BARO sensor   x   x x       x       x      
Ion sensor No. 1-No. 4       x x                      
KS               x                
A/F sensor         x       x              
HO2S         x                      
Refrigerant pressure sensor                       x x      
IG1 relay x   x   x x   x   x x   x x    
Brake switch (No. 1 signal)   x                            
Brake switch (No. 2 signal)   x                            
CPP switch (MT)   x     x     x       x        
Starter interlock switch (MT)                           x    
Neutral switch (MT)   x     x     x       x        
Electric variable valve timing motor/driver       x                        
Battery     x     x x x x           x  
Generator (Stator coil)   x                            
CAN related parts (1)   x     x     x       x x x x  
ECT sensor No. 2 (2) Only used for OBD.
Fuel tank pressure sensor (2) Only used for OBD.
(1) DSC HU/CM, TCM (AT), instrument cluster, BCM, start stop unit
(2) U.S.A. and CANADA
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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